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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef25a09afaa3ee57ea1913380d93e01d62a9681d3af255d860528133d91e68a6' 
  AND token = 'WSB48pOYZW5eKQUsn5mmfeE509emQ9a2Kh9Otb3pGsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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