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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075a34833b7c2531d916646ce0843dfd010574c14de7b3e039bb27fa8d9166b9' 
  AND token = 'DTsNE4hACIyaoQBq5WOohLoYxyzPoyvnib+w2Qwvqaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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