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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f817203f6a3a63dde35af1730970690a883f2b4319ff530b1b2138f5c0114834' 
  AND token = 'yxTgOEt4BskiirbY/Q744oJLkLMg95qBvmCsa0BO8QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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