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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edf403dbf69bb101882923b0b35696596784d24d63b0d81be397b357162e5db' 
  AND token = '73BELB7gonxdTm/91JxNglkUfi4SYVhV5y2WR+v/tYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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