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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdd4ed2e95bfac34f0b6d5972d3c0e15368e98cf909762e5802dd250ef456e0' 
  AND token = 'ebVTuPS9EAxm65BI9oKUP9nYsz/pqqq4etu1CwUiUF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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