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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd81e79167ea1e872be631e972a7dd802e41e99e5136813ca2a38ac8ed1b31e' 
  AND token = 'tycqYVexaIk919/lKFA1JG4usObQ3wIDPJM0l5ytPKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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