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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2685c8360097de1166e5063abe9af0eb3099ce2b8c2ad844f9fd933ba9c84bfa' 
  AND token = 'w+w3DI7oUzULBL+JGObMWLGajLiQniZk57FlXmNTZbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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