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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a90045db6ef0839b1fbdacd9964685d2203c5bf6b5d0605e465f1d60d05e4b' 
  AND token = '6SEcUG7AwKL6FVZ4jSivimp5sLgEN7hYbqT0jJn2w0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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