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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85353c3287e37c11cc2cf26362323350088b1e2a32b1aa04eb3d2f39311de810' 
  AND token = 'caJ8xYcgo1khYU7BlJbuR2FaTu3Chc/a+F3sZK+4xXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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