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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbaa27ca2e514b22e9185e639537a12aa7317afb2d6766c0cb48245dc6b399bd' 
  AND token = '9r49LCVhsmVqz5Zt7yrNJOcqcJFpF/0/ZcZ+2/f1Krw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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