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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196dcf296dd56b937c8520ce38b64945ea0d38da744ba7cdc0a4c2bace08ba21' 
  AND token = '8pBTzAhDfaRJOPJIFnlWi3Nm0J5QSj1VaXXhOALA2rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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