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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a3bc19e061e1f17011529ce04e232c4d7d415e09f3bc58ade906ba5bc9b8f4' 
  AND token = 'FCGniiRdLZJfCOjwt8I1/GQL3rQJkgflefz55URe5BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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