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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3eb48a7197dd20c92ea569e27868bab23e60cd12c93e01198dc76d22e3cc1d' 
  AND token = 'LnBukOju/aV+nLKqFAPFDzOoT35m112KkM8XvvjYWq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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