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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4cabce9f2edc692b6651073cc00d92f0f1f4b9fca6a63cff7b712d200b77d1' 
  AND token = '7vP3hR2qQmEAINTsvZFMiyF5MtvS1sFXxQNt2zGt/Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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