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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a24c3999c3550839adba61a3d491ef5310bced14d2ca033e47d54601dd34ec' 
  AND token = 'WA05semp4UUTrtq+ggT/GQMIUKRE4kJRkOHoFGs/nxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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