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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884c0e778bdc886c70390faf45afa174edd399ed58cc09cc822869ab51d27323' 
  AND token = 'ZgZFRhxD01Fh3vd+CNc0N4b/YZK2W6hjuEOwCDdemkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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