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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b4d863c053d7aa294f44ab573dde1081973ada6189a8e0d3f275171bb43aa9' 
  AND token = 'y0ozDue0RpbMjCz5egc12q6gJthP7eo6b3NHr04NK3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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