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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4e2feeb58c4afa3dc187496296cab96c121069d6a8141ad2f1dda7514ba752' 
  AND token = 'NCJmfHARs34cwhtZ0tiqtgs7mihaK/1oCQ5DdkyMrS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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