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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a302dd4c636be51d26ce5a507030eaf3bfc2c573dac1b683bf5c4d1711dedb' 
  AND token = 'lfLt+JrQaIquzGtkcAwN9LF8n6N0hCJiY9du9fl1siM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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