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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111ad2233531c6cf3c6d3ef8c1adf72fa55f7a1debffef594f83114e396eb637' 
  AND token = 'OqSREO6oL3yweF5AEK8nuEYhYgCTYxo/TxnD/G1YwRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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