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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673db9d8219e75fa483cde98b67511d64753b2c79f52dfa582ef920c78ae3b8d' 
  AND token = 'sepKaUNC+cNnopOVAqbMRWW3GIvE+7tSQfYjLi/2ias=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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