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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f43c27a281a1a5f5a144e29e9bb3c36ddf95915f96749fe6e1c23b1ac83aeaf4' 
  AND token = 'WCML2XG0Ik1GFsv16CPRfjl9hmMG4nDUcNkNxfGTYBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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