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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de3ac185df5481be549bc5874397b69cfa2f689f40d01b958306ce0d6dc6151' 
  AND token = '8+C42WrW00nurLCqQ+pUail5IH9xHkq/UqU9m32hc6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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