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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa732dd7f6f541e3d7f7b74e23a830db5f9687c7f1721d85829634201a25c699' 
  AND token = '3uIPA74UK3yEPjUs5C5THF0Qhf8QVORpf+dIA2pttJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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