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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ebd472c6884f95919a3c8e742388efda6d5a916257863dc36896991cab4d4d' 
  AND token = 'u+O3fATiurzdCL1iAK6MeAZriNLmlPup5ZPPvxaBA+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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