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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179bca1e5bdfd71135ef24e89e101739bad20db860f3df20e2a287fd7f53892a' 
  AND token = 'xQ107Z7a1pmg3GrS7E8dRC7uivn8DQs8edVlfcv/TOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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