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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17283bd8f2366e00910a194ffa8b4fc144367f86139cea9ef39cc0bc1379dac4' 
  AND token = 'pr3jJP82wtLJvw5efB2RxN00jTfQKgHWi390F/sqsY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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