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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b6630a843d3e08211170d6e8eb374ec7c5c633a46aa97a0f00694261a58e68' 
  AND token = 'xN6T9EPvRLxrYR8l5NqEyVmqk1qWkb60W9kXdF8uC3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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