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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c41e7b916b034a2faa918c256e33821c931eb6a7477c9cc432bd382487f9f32' 
  AND token = 'a/PYb1m/x852gP91uxGS3VAfL850o9pyimxghp3+sHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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