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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dca521c259397a3fd13ca492e182ac3a47ec254731cfdee968993f947ef6735' 
  AND token = 'waz9PoEYt9LPj497DUYe4y/biU0ZbC7LeYS+Yjnype8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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