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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46b31e7f41a2f0b033948a0dcd44a1c88dbe0f85cd90215f492eb26c7fb21bd9' 
  AND token = 'eaUBpBbvi2yUsiBZCeAfKreOfRLi/CFwnKu2/+sxCQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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