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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbe6490a094177bb0ddee057e76a801bf64b5d5613a6d4b514fc84089fd942a' 
  AND token = 'lCksGwaqP+ITLLPeS+kIIz1D5sY6mA35xSB/INH1dR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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