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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b035e934121380f5f3a0ddb8298c034653989a3724de98e30ad9384485339f5' 
  AND token = 'HZ4pl2SLDLW4wQe4/qaIC3qiJjvHNdEDqkdO5ZMBq1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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