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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ca9498a348b018eeb3a9b9f322d854df8bf5e2772b7132e919300af8f82fef' 
  AND token = '/9s4QHa9AMQp1hS4l9LDxOcJCElRgOnWXEVpvY2gJIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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