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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb664601b402dad683d0b08f9e395e88d823e7052c33ecb9cbec52526a329969' 
  AND token = 'pRFV9lr5tfMPncjMFsrut/9xOnTeNWat0QadfyCVfl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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