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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba332fbbb778f9b179b477deef7fba79140554ae3a6fed0b49a0c96919ecec5' 
  AND token = 'ykfDIYL1Tws7/lvxYtShZwopKA87+kFKzoWJ1CBp1CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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