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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eee48386bca3a647c4e7621551a99692e06c4fd6938e990d12ab1c5884972ec' 
  AND token = '2Dsm6iAHzyDW27N9uQV+1f2nJw5r05RicDA1mKYzthM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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