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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e9818020dd445b3e41bbedb4dd6c6de236ae41925d960e9fad5d9d4e81880c' 
  AND token = 'w2K+vzsyT50ITDDPTwMdJ/v9zHK1JExiERwdrgTOT7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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