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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bad8e27b4ecf0be34c4deed0391143092e3ece65d9cd940ce1fefb33aa96f1' 
  AND token = 'HpVqfdo2YRuqauyUPchv5e80d3a0zV+kK3TObIQwat0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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