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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a769e59cb36e7bdcecf164e471444c0399cfb4d67751ec266618b6ac3848b215' 
  AND token = 'sSHfhXn4qq4j/027KqjYnsQA/8vllIVksUTSw067yC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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