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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c512e082231e7bd2664aeacd2ea0177b878ecf4a83523cba568837545cecd29' 
  AND token = 'HGyZ5olcdUG9cTaVJJN47ih2zOnDvZ82jf3ainrrLnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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