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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27cc0154256e3064a123df2a1c8f93656a56c700c4abe796124eeff659c2c6b7' 
  AND token = 'b1NfqofiiWMgJkflD7VF5MmWho5bKKs+0F86cj2Kdwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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