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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a51d9b4f71b3d506d5ac9227d6e6e9f9687432abf7d40b6242f000a98093113' 
  AND token = 'wk9IGj7ndHs7CFCjup9CZ0wys0QHkdPQuuSr6y4ofeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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