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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079e36390f962774d4ed4108aae304aaac62369029bc6b33d54ab9a19eb31c29' 
  AND token = '/i0xLjCw88KGIeR6ODUx94I14WRSFxT306z4hsz0aFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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