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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fece5fc39fda50b9f65b220b3b253dc49c5da09cf2218567daf1150098ce3c2d' 
  AND token = '3NbtIuFg0vf8+hZbuXWiwLeEf31tMJgDiDAqgEamIHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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