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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ac402fe7d52391d389f0639a0cd8fbbe3cb88bfbb1f25f20e74ff39864bbdc' 
  AND token = 'D6Ec7EDdarbZLfOUOupL0wDwAPZXc5gNzVdNz1v8dFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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