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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e0a323e73145dbd86f0a59c41f7172ebae977171e5c79065ac2fd6507caf1b' 
  AND token = 'VVpF+RdJReuxRYa0kRvGKabcIm5ATNVjNi/bBM6yD0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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