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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e4ba5c1037c021b37c096f3da9e7a5d08f820964997d91b09a74d726afbdbb9' 
  AND token = 'NUQ3KhbuNs56Ne7i5XWoOT5JpB/8Oh8if7Yocuru+KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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