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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d908ee6b1c10631b0806e9240f990bf98a8be86943e1bed209a76ddff1ad29e' 
  AND token = 'bIMkfvMTTJA22EehFn9ZvrfL8+JJHq54oHwUZPFLvB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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