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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934110927365359c292e659756fa3f8a5db7aad6c0cfc967897bde7f9733756e' 
  AND token = 'n8Es3CgOPNXJWUrwi+J+MltEHy1pwVcYZ6hSK4dC9eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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