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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6e87e597a271e5f03074a6d9ccb228abc86fa45bc1e288620b44898c3b69b0' 
  AND token = 'rfm1iWk2I9J1qtfERYVj+7J3vrtA2k1y3chrmljQdLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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