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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0dcbe27d6efd3e3836d4f6f7eb52c856d04ebec6c9a7c25c8e63b3e4ae17a8d' 
  AND token = 'GPJ20LxFZjGTS3NPcKIreSOuNjfcoBq+v5ug2eQsqwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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