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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487c20ac5ab7909041481020b2f0461ed7947d2e7db6e6d415ffaf1bc8bda30f' 
  AND token = 'avEbVK7XvgajJA7E+LRe5LpCnQiIQ8RxAsxsGYMqFFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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