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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd5a08e3a4d07c7c7597ae82c0a5d5952c8370456e536de10787fab71782dd1' 
  AND token = 'l/sm7SC6i9lPwJxkEsJcwMKY0NI6C/iq9F9RteZ8N9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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