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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff2c7f563a1516d3a4e7bb74dc0cdd90751fb0fcfb1877e7a4d30fcd18c889b' 
  AND token = 'BZbKkX0T69KxtB5dEXg90gEir29nrjdEN0zfdff5oH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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