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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02df38ba41abc368c3cfe711a4d1933d9de89611fdecb3ea842a9094cc45385' 
  AND token = 'Hu0wRqvGJ842h2rIi4JgfaOHFYKjsPtnkw2jJrTWCYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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