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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50676af6175676ec39ae4a11978d162bcc8c0ed9699b8015b0e0594694d0e749' 
  AND token = '85mqUq+9HKtN/EACXTFno8ALxqe3bneij4KtRele3Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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