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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a92e5ef7bd348a09ea1acc6ba7b4d2fd60daa4936cd3639d11eb05f2c2e8f0' 
  AND token = 'UxvT8vF52wfPl7J3fYUQ75mHJcRDcxwe5Mu7W8ajPbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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