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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef9d477ed0d55a17d5351d2c7b7c830bf4b54732296e6e0315a6edd2d8a74e6' 
  AND token = '/9uzo8kMkMchrhbgfUP68vraR6C8Ia6HPskXpDWp0xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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