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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e47d30620701c9591b91d3910983f90ee960ec236a45c0dda4a086ab256b206' 
  AND token = 'w4SAHgemF0kRf5pNZjTWYiXN4bk8OEAQgZ9fe2iGoW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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