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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4089894549809c3e918c2028badf2255bf9d80403e95c936625262e15860ecb9' 
  AND token = 'Ke5isjXLR3FUCkO5DT9uFdwxK7PNlw/vgnV9nwFJ/W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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