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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e6d32c9243d3e137c18be96be6dc97ae0668ace4f70ef6af501f9df032805e' 
  AND token = 'UMYiMfiR8ua9lme/4ESNufMW2s8+hJQP/ShVRtwKfQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}