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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1499933f7d20105c9c0eee8511a86b5f278d3c01029f235676075790f40a097a' 
  AND token = '5bZRJQhquA1mio8M91kJbyM8Bo2uGxcdi1ebWtyXEuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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